____________________ prototyping is the process of creating a solid model in a computer-controlled machine using a CAD design file.
Fill in the blank(s) with the appropriate word(s).
Rapid
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?Strain is measured in millimeters per ____.
A. ?centimeter B. ?millimeter C. ?kilogram D. ?gram
Which type of refrigerant hose is used with an R-134a system?
A) Barrier hose B) Rigid hose C) Flexible, porous hose D) Copper type hose
It is important to the HVACR technician to understand the changes of state of matter because:
A) NATE certification exams require a good understanding of the Periodic Table of Elements. B) The refrigerant recovery process requires a technician to know which state the matter is in to ensure that only like refrigerants are put into a recovery container. C) Technicians are required to mix refrigerants to attain proper pressures and temperatures when charging refrigeration systems. D) The cooling and heating process requires a change of state of matter in some form.
With regard to a rectangular waveform, a transition is a change from
A) pulsating direct current to smooth direct current B) ac to dc C) dc to ac D) either dc level to the other